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Noncontrolling Interest in Subsidiaries - Changes in Ownership Interest in Subsidiaries (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]        
Net income (loss) attributable to Valhi stockholders $ (34.2) $ 22.9 $ (113.7) $ 156.2
Transfers from noncontrolling interest — Issuance of subsidiaries’ common stock     (0.3)  
Net income (loss) attributable to Valhi stockholders and change from noncontrolling interest in subsidiaries     $ (114.0) $ 156.2